2-[2-(1-Bromoethyl)phenyl]-4,4,5,5-tetramethyl-1,3,2-dioxaborolane | 1400742-82-6

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: 2-[2-(1-Bromoethyl)phenyl]-4,4,5,5-tetramethyl-1,3,2-dioxaborolane
• 英文别名: 2-[2-(1-bromoethyl)phenyl]-4,4,5,5-tetramethyl-1,3,2-dioxaborolane
• CAS: 1400742-82-6
• 化学式: C₁₄H₂₀BBrO₂
• 分子量: 311.027
• InChiKey: SICYISIHOVLDFG-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.44
• 重原子数：
  18
• 可旋转键数：
  2
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.57
• 拓扑面积：
  18.5
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为产物：
  描述：

  邻溴苯甲醛 在 正丁基锂 、 potassium tert-butylate 、 copper(l) chloride 、 1,2-双(二环己基磷基)-乙烷 作用下， 以 四氢呋喃 为溶剂， 反应 20.83h， 生成 2-[2-(1-Bromoethyl)phenyl]-4,4,5,5-tetramethyl-1,3,2-dioxaborolane
  参考文献：
  名称：

  通过 1,3-卤素迁移铜催化回收卤素活化基团

  摘要：

  Cu(I) 催化的 1,3-卤素迁移反应通过将溴或碘从 sp(2) 转移到苄基碳并伴随 Ar-X 键的硼化，有效地回收了活化基团。所得苄基卤可以在同一容器中在各种条件下反应以形成额外的碳-杂原子键。使用同位素富集的溴化物源的交叉实验支持 Br 的分子内转移。假设该反应通过邻卤苯乙烯的马尔科夫尼科夫氢铜反应、所得 Cu(I) 络合物氧化加成到 Ar-X 键中、还原消除新的 sp(3) CX 键和最终硼化反应进行Ar-Cu(I) 物种翻转催化循环。

  DOI：

  10.1021/ja306446m

文献信息

• COPPER CATALYZED HALOGENATON AND REACTION PRODUCTS
  申请人：Wisconsin Alumni Research Foundation

  公开号：US20140371480A1

  公开（公告）日：2014-12-18

  A Cu(I)-catalyzed 1,3-halogen migration reaction effectively recycles an activating group by transferring a halogen from an sp 2 to a benzylic carbon with good enantioselectivity and concomitant borylation of the Ar-halo bond. The resulting enantio-enriched benzyl halide can be reacted in the same vessel under a variety of conditions to form an additional carbon-heteroatom or carbon-carbon bond while maintaining high ee. The reaction can be used to efficiently prepare novel compounds and intermediates for the preparation of therapeutics and ligands for catalysis.

  一种Cu(I)催化的1,3-卤迁移反应有效地通过将卤素从sp2转移到苄基碳来循环利用一个活化基团，具有良好的对映选择性并伴随Ar-卤键的硼化反应。所得的对映富集的苄基卤化物可以在同一容器中在各种条件下反应，形成额外的碳-杂原子或碳-碳键，同时保持高的ee。该反应可用于高效制备新型化合物和制备治疗剂和催化剂配体的中间体。
• Development of N-Heterocyclic Carbene–Copper Complexes for 1,3-Halogen Migration
  作者：Steven C. Schmid、Ryan Van Hoveln、Jared W. Rigoli、Jennifer M. Schomaker

  DOI：10.1021/acs.organomet.5b00629

  日期：2015.8.24

  A series of NHC-copper complexes was synthesized and their potential to catalyze 1,3-halogen migration explored. Increasing the steric bulk around the metal drastically improves the lifetime of NHC-CuH species and promotes 1,3-halogen migration of both 2-bromo- and 2-chlorostyrenes through transfer of an aryl halogen to a benzylic carbon with concomitant arene borylation. The NHC-based system displays a broad substrate scope with notable advantages over previously reported phosphine-based catalysts, including complete selectivity for migration versus competing benzylic borylation, increased steric tolerance, efficient aryl chloride migration, and facile formation and characterization of organocopper catalytic intermediates. Experimental evidence and DFT calculations support a mechanism proceeding through dearomatization of a benzyl copper species, followed by a 1,4-halogen shift and borylation of the resulting ArCu(I) intermediate.
• Mechanistic Studies of Copper(I)-Catalyzed 1,3-Halogen Migration
  作者：Ryan Van Hoveln、Brandi M. Hudson、Henry B. Wedler、Desiree M. Bates、Gabriel Le Gros、Dean J. Tantillo、Jennifer M. Schomaker

  DOI：10.1021/ja511236d

  日期：2015.4.29

  An ongoing challenge in modern catalysis is to identify and understand new modes of reactivity promoted by earth-abundant and inexpensive first-row transition metals. Herein, we report a mechanistic study of an unusual copper(I)-catalyzed 1,3-migration of 2-bromostyrenes that reincorporates the bromine activating group into the final product with concomitant borylation of the aryl halide bond. A combination of experimental and computational studies indicated this reaction does not involve any oxidation state changes at copper; rather, migration occurs through a series of formal sigmatropic shifts. Insight provided from these studies will be used to expand the utility of aryl copper species in synthesis and develop new ligands for enantioselective copper-catalyzed halogenation.
• Copper-Catalyzed Recycling of Halogen Activating Groups via 1,3-Halogen Migration
  作者：R. David Grigg、Ryan Van Hoveln、Jennifer M. Schomaker

  DOI：10.1021/ja306446m

  日期：2012.10.3

  A Cu(I)-catalyzed 1,3-halogen migration reaction effectively recycles an activating group by transferring bromine or iodine from a sp(2) to a benzylic carbon with concomitant borylation of the Ar-X bond. The resulting benzyl halide can be reacted in the same vessel under a variety of conditions to form an additional carbon-heteroatom bond. Cross-over experiments using an isotopically enriched bromide

  Cu(I) 催化的 1,3-卤素迁移反应通过将溴或碘从 sp(2) 转移到苄基碳并伴随 Ar-X 键的硼化，有效地回收了活化基团。所得苄基卤可以在同一容器中在各种条件下反应以形成额外的碳-杂原子键。使用同位素富集的溴化物源的交叉实验支持 Br 的分子内转移。假设该反应通过邻卤苯乙烯的马尔科夫尼科夫氢铜反应、所得 Cu(I) 络合物氧化加成到 Ar-X 键中、还原消除新的 sp(3) CX 键和最终硼化反应进行Ar-Cu(I) 物种翻转催化循环。